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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 25704
Location: Livermore CA USA
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 Posted: Sat Aug 31, 2013 5:35 pm Post subject: 3/16 vs 1/4 Brake Lines... |
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At 06:22 PM 8/31/2013 Saturday, you wrote:
| Quote: |
My RV8a project is ready for wheels, and I keep thinking about the brake system and lines. Seem to me like some weight could be saved by going with 3/16 brake lines, (smaller line and less fluid). Problem with small lines is the heavy viscosity of A/C hydraulic oil, especially when cold. Solution would be automotive Dot 3 or Dot 4, but are there compatability issues with the Matco master cylinders and Cleveland calipers? Maybe new o-rings could solve the problem? Anyone know the answer?
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Hi Dennis,
Hum, you should actually put the parts and fluid between a 1/4" and a 3/16" system on a scale and weigh them. I think that you're going to find the difference in weight is almost negligible. Oh the other hand, the difference in braking capabilities could be deadly. Personally, I could stand to lose 50 lbs around my belly. That is some realy weight savings that would make my RV fly a lot better. 
I've done a fair amount of custom stuff on my RV, but when it comes to engineered stuff like the size of the brake lines, and other dimensional stuff, Van's is the man. Van's hates fat airplanes. If he felt that 3/16" brake lines would be adequate, I know for certain that he would have used them.
Matt's $.02.
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Matt Dralle
RV-8 #82880 N998RV "Ruby Vixen"
http://www.mattsrv8.com - Matt's Complete RV-8 Construction Log
http://www.mattsrv8.com/Mishap - Landing Mishap Rebuild Log
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 172+ Hours TTSN - Rebuilding Fuselage After Landing Mishap...
RV-6 #20916 N360EM "The Flyer"
http://www.mattsrv6.com - Matt's RV-6 Revitalization Log
Status: 180+ Hours Since Purchase - Upgrades Complete; Now In Full Flyer Mode
Matt's Livermore Airport Live ATC Stream!
Check out the live ATC stream directly from my hangar at the Livermore
Airport. Includes both Tower and Ground transmissions. Archives too!
For entertainment purposes only. http://klvk.matronics.com
| | - The Matronics RV8-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV8-List |
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_________________
Matt Dralle
Matronics Email List Administrator |
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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 25704
Location: Livermore CA USA
|
| Posted: Sat Aug 31, 2013 5:36 pm Post subject: 3/16 vs 1/4 Brake Lines... |
|
|
At 06:22 PM 8/31/2013 Saturday, you wrote:
| Quote: |
My RV8a project is ready for wheels, and I keep thinking about the brake system and lines. Seem to me like some weight could be saved by going with 3/16 brake lines, (smaller line and less fluid). Problem with small lines is the heavy viscosity of A/C hydraulic oil, especially when cold. Solution would be automotive Dot 3 or Dot 4, but are there compatability issues with the Matco master cylinders and Cleveland calipers? Maybe new o-rings could solve the problem? Anyone know the answer?
|
Hi Dennis,
Hum, you should actually put the parts and fluid between a 1/4" and a 3/16" system on a scale and weigh them. I think that you're going to find the difference in weight is almost negligible. Oh the other hand, the difference in braking capabilities could be deadly. Personally, I could stand to lose 50 lbs around my belly. That is some realy weight savings that would make my RV fly a lot better.
I've done a fair amount of custom stuff on my RV, but when it comes to engineered stuff like the size of the brake lines, and other dimensional stuff, Van's is the man. Van's hates fat airplanes. If he felt that 3/16" brake lines would be adequate, I know for certain that he would have used them.
Matt's $.02.
-
Matt Dralle
RV-8 #82880 N998RV "Ruby Vixen"
http://www.mattsrv8.com - Matt's Complete RV-8 Construction Log
http://www.mattsrv8.com/Mishap - Landing Mishap Rebuild Log
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 172+ Hours TTSN - Rebuilding Fuselage After Landing Mishap...
RV-6 #20916 N360EM "The Flyer"
http://www.mattsrv6.com - Matt's RV-6 Revitalization Log
Status: 180+ Hours Since Purchase - Upgrades Complete; Now In Full Flyer Mode
Matt's Livermore Airport Live ATC Stream!
Check out the live ATC stream directly from my hangar at the Livermore
Airport. Includes both Tower and Ground transmissions. Archives too!
For entertainment purposes only. http://klvk.matronics.com
| | - The Matronics RV8-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV8-List |
|
_________________
Matt Dralle
Matronics Email List Administrator |
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